Ups, I am not familiar with iTunes. I used Twonky on Linux up to now. I installed sqlite and some other debian packages, compiled 1005, changed the config a bit and that’s it. Now I can select either Twonky or mt-daap in my Soundbridge. Thus I asked those silly questions…
I serve a directory which contains only mp3, all tagged. A sub-directory Sampler contains what it’s called. In Twonky I was able to specify that directory in the config so that it wouldn’t create an Artist entry for these files.